EP0068304A2 - Process for heating coke ovens and system for carrying out the process - Google Patents
Process for heating coke ovens and system for carrying out the process Download PDFInfo
- Publication number
- EP0068304A2 EP0068304A2 EP82105270A EP82105270A EP0068304A2 EP 0068304 A2 EP0068304 A2 EP 0068304A2 EP 82105270 A EP82105270 A EP 82105270A EP 82105270 A EP82105270 A EP 82105270A EP 0068304 A2 EP0068304 A2 EP 0068304A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- heating
- circulating
- machine
- intensity
- coke
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 54
- 239000000571 coke Substances 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000007423 decrease Effects 0.000 claims description 5
- 238000007664 blowing Methods 0.000 claims 1
- 230000000630 rising effect Effects 0.000 claims 1
- 206010022000 influenza Diseases 0.000 abstract 4
- 239000007789 gas Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 6
- 239000003546 flue gas Substances 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000005192 partition Methods 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000012429 reaction media Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B21/00—Heating of coke ovens with combustible gases
- C10B21/10—Regulating and controlling the combustion
- C10B21/18—Recirculating the flue gases
Definitions
- the invention relates to a method for heating coke ovens with the aid of circulating currents in the heating trains and to a device for carrying out the method.
- the aim of heating coke ovens is to achieve a well-cooked coke of uniform quality through uniform heating.
- the invention proposes that the intensity of the circulating currents from the machine to the coke side be designed to be continuous or discontinuous.
- the intensity of the circulating current is understood to be the amount of the flue gases sucked back in relation to the amount of flue gas formed from the freshly supplied combustion media gas and air.
- the invention initially provides for this variation to decrease from the machine to the coke side.
- the variation of the circuit current intensity can be carried out continuously from one pair of heating trains to the next, or in stages.
- a grading in groups can be understood to mean a grading from group to group from the machine to the coke side, with several pairs of heating trains each forming a group.
- the grading of the circuit current intensity in a heating wall can also be done discontinuously. For example, it can be carried out in a small step in part of the heating cables of a heating wall widths occur, while after a large step in the subsequent heating trains small increments are again realized.
- the flow conditions in the first part of the heating wall should be in a small scattering range in the case of laminar flow and in the other part of the heating wall in a small scattering range in the case of turbulent flow.
- discontinuous grading may also be necessary in such a way that the circulating current intensity in some heating elements of one heating wall must increase towards the coke side, while it decreases in the others.
- the circulating current has a self-regulating effect.
- This self - regulating effect of the circulating flow consists in the fact that the amount of circulating electricity decreases as the furnace output increases, while the amount of smoke gas sucked in increases as the heating output decreases.
- This effect means that the flame lengths can be kept almost constant even with fluctuating furnace outputs over a wide range.
- This effect also meets the heating requirements in composite stoves.
- a lower circulating current is required for lean gas heating and a stronger one for high gas heating. Since larger amounts of exhaust gas are primarily generated with lean gas heating than with high-gas heating, a lower flue gas return is automatically established with lean gas heating due to the self-regulating effect.
- the circular current is equal due to its self-regulating
- the effect of intensity also automatically almost completely eliminates the requirements of the different types of underfire gas.
- the settings of the circulating current intensities in the different heating trains of a heating wall are selected by constructive design or regulation of the resistances in the flow paths in such a way that the self-regulating effect of the circulating current is optimally used when the output or gas type of the furnace heating is changed.
- the invention provides that these cross-sections over the entire wall length or zone by zone individually or together from the machine to the coke side can be varied. In the case of a common change, this can be done proportionally in the same direction or in the opposite direction.
- the invention provides that the total cross sections for each circular flow or reversal point consist of one or more openings. It also provides that each or each of these openings with one or more throttling members, e.g. B. sliders or flaps can be provided.
- throttling members e.g. B. sliders or flaps
- the invention provides that the intensities of the circulating currents in the heating trains are increased by additional gas jets of increased speed in a manner known per se - if necessary differently.
- twin heating trains - represents a section of a heating wall, which consists of a large number of twin heating trains connecting to the left and right up to the machine or coke side.
- the partition 3 of the heating cables 1 and 2 has at its lower end two circuit flow openings 4 / which in the present case can each be closed with one or more flaps 5.
- the cross sections of the circular flow openings as explained in more detail above, differ from the machine to the coke side.
- the heating cables in the embodiment shown are connected to one another by two openings 6 and 7, the so-called reversal points, one above the other.
- each of these openings is assigned a roller 8 or 9, which can completely or partially release this opening or also practically completely close it.
- the cross sections of the two reversal points are preferably designed differently, just like those of the circular flow openings from the machine to the coke side.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Materials Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Coke Industry (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
- Inorganic Insulating Materials (AREA)
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren zur Beheizung von Koksöfen mit Hilfe von Kreisströmen in den Heizzügen sowie auf eine Einrichtung zur Durchführung des Verfahrens. Ziel der Beheizung von Koksöfen ist die Erreichung eines gut abgegarten Kokses gleichmässiger Qualität durch gleichmässige Beheizung.The invention relates to a method for heating coke ovens with the aid of circulating currents in the heating trains and to a device for carrying out the method. The aim of heating coke ovens is to achieve a well-cooked coke of uniform quality through uniform heating.
Da die Kammerbreite bei Koksöfen von der Maschinen- zur Koksseite hin zunimmt, steigt auch in gleicher Richtung der Wärmebedarf von Heizzug zu Heizzug. Durch entsprechende Verteilung der Beheizungsmedien wird die horizontale Gleichmässigkeit der Beheizung erreicht. Umgekehrt aber zum Wärmebedarf ändern, d. h. verringern, sich in gleicher Richtung die Querschnitte der Heizzüge. Daraus resultieren von der Maschinen- zur Koksseite hin grössere Geschwindigkeiten der Verbrennungsgase und grössere Flammenlängen. Diese beeinflussen die vertikale Gleichmässigkeit der Beheizung.Since the chamber width in coke ovens increases from the machine side to the coke side, the heat requirement increases from heating train to heating train in the same direction. The horizontal uniformity of the heating is achieved by appropriate distribution of the heating media. Conversely, change to heat demand, d. H. reduce the cross sections of the heating cables in the same direction. This results in higher combustion gas speeds and longer flame lengths from the machine to the coke side. These affect the vertical uniformity of the heating.
Nun kann man die Flammen verlängern durch die Anwendung des Kreisstroms, d. h. durch Ansaugung von ausgebranntem Abgas aus dem fallenden Heizzug in den aufsteigenden, beflammten Heizzug, wobei das ausgebrannte Rauchgas den frisch zugeführten Verbrennungsmedien beigemischt wird. Hierdurch verringern sich die Anfangskonzentrationen der Reaktionsmedien, und der Ablauf der Verbrennungsreaktion wird verzögert, d. h. die Flammen werden verlängert. Dies ist eine Funktion der Intensität des Kreisstroms.Now you can extend the flames by using the circulating current, ie by sucking in burned-out exhaust gas from the falling heating train into the ascending, flaming heating train, the burned-out flue gas being mixed with the freshly supplied combustion media. This reduces the initial concentrations of the reaction media, and the course of the combustion reaction is delayed, ie the flames are extended. This is a function of the intensity of the circulating current.
Die Anwendung des Kreisstroms bei der Beheizung von Koksöfen ist an sich bekannt und bewährt. Es hat sich jedoch gezeigt, dass die Flammenlängen von der Maschinen- zur Koksseite hin unterschiedlich durch den Kreisstrom beeinflusst werden müssen.The use of the circulating current for heating coke ovens is known and proven per se. However, it has been shown that the flame lengths from the machine to the coke side have to be influenced differently by the circulating current.
Die Erfindung schlägt hierzu vor, dass die Intensität der Kreisströme von der Maschinen- zur Koksseite kontinuierlich oder diskontinuierlich variabel ausgebildet wird. Unter der Intensität des Kreisstroms sei die Menge des rückgesaugten Rauchgasen im Verhältnis zu der aus den frisch zugeführten Verbrennungsmedien Gas und Luft gebildeten Rauchgasmenge verstanden.To this end, the invention proposes that the intensity of the circulating currents from the machine to the coke side be designed to be continuous or discontinuous. The intensity of the circulating current is understood to be the amount of the flue gases sucked back in relation to the amount of flue gas formed from the freshly supplied combustion media gas and air.
Die Erfindung sieht zunächst vor, dass diese Variation von der Maschinen- zur Koksseite hin abnehmend erfolgt. Die Variation der Kreisstromintensität kann dabei kontinuierlich von Heizzugpaar zu Heizzugpaar oder gruppenweise gestuft vorgenommen werden. Unter gruppenweiser Stufung kann eine solche mit gleichmässiger Stufung von Gruppe zu Gruppe von der Maschinen- zur Koksseite hin verstanden werden, wobei mehrere Heizzugpaare jeweils eine Gruppe bilden.The invention initially provides for this variation to decrease from the machine to the coke side. The variation of the circuit current intensity can be carried out continuously from one pair of heating trains to the next, or in stages. A grading in groups can be understood to mean a grading from group to group from the machine to the coke side, with several pairs of heating trains each forming a group.
Die Stufung der Kreisstromintensität in einer Heizwand kann aber auch diskontinuierlich erfolgen. Beispielsweise kann sie in einem Teil der Heizzüge einer Heizwand in geringen Schrittweiten erfolgen, während dann nach einer grossen in den nachfolgenden Heizzügen wieder geringe Schrittweiten zur Verwirklichung kommen. Hier sollen sich die Strömungsverhältnisse im ersten Teil der Heizwand in einem geringen Streubereich bei laminarer Strömung und in dem anderen Teil der Heizwand in einem wiederum geringen Streubereich bei turbulenter Strömung befinden.The grading of the circuit current intensity in a heating wall can also be done discontinuously. For example, it can be carried out in a small step in part of the heating cables of a heating wall widths occur, while after a large step in the subsequent heating trains small increments are again realized. Here, the flow conditions in the first part of the heating wall should be in a small scattering range in the case of laminar flow and in the other part of the heating wall in a small scattering range in the case of turbulent flow.
Es kann allerdings auch eine solche Variante diskontinuierlicher Stufung erforderlich sein, dass die Kreisstromstärke in einigen Heizzügen einer Heizwand zunehmen muss in Richtung zur Koksseite hin, während sie in den anderen abnimmt.However, such a variant of discontinuous grading may also be necessary in such a way that the circulating current intensity in some heating elements of one heating wall must increase towards the coke side, while it decreases in the others.
Es ist bekannt, dass der Kreisstrom eine selbstregulierende Wirkung besitzt. Diese selbstregulierende Wirkung des Kreis - stromes besteht darin, dass bei steigender Ofenleistung die Kreis - strommenge zurückgeht, während bei sinkender Beheizungsleistung die angesaugte Rauchgasmenge verstärkt wird. Durch die - sen Effekt können auch bei schwankenden Ofenleistungen in weitem Streubereich die Flammenlängen nahezu konstant gehalten werden. Dieser Effekt kommt auch bei Verbundöfen den Erfordernissen der Beheizung sehr entgegen. Bei Schwachgasbeheizung ist ein geringerer Kreisstrom erforderlich, bei Starkgas - beheizung ein stärkerer. Da bei Schwachgasbeheizung grössere Abgasmengen primär erzeugt werden als bei Starkgasbeheizung, stellt sich automatisch bei der Schwachgasbeheizung durch die selbstregulierende Wirkung eine geringere Rauchgasrücksaugung ein. Somit gleicht der Kreisstrom durch seine selbstregulierende Intensitätswirkung auch die Erfordernisse der unterschiedlichen Unterfeuerungsgasarten automatisch nahezu aus.It is known that the circulating current has a self-regulating effect. This self - regulating effect of the circulating flow consists in the fact that the amount of circulating electricity decreases as the furnace output increases, while the amount of smoke gas sucked in increases as the heating output decreases. This effect means that the flame lengths can be kept almost constant even with fluctuating furnace outputs over a wide range. This effect also meets the heating requirements in composite stoves. A lower circulating current is required for lean gas heating and a stronger one for high gas heating. Since larger amounts of exhaust gas are primarily generated with lean gas heating than with high-gas heating, a lower flue gas return is automatically established with lean gas heating due to the self-regulating effect. Thus the circular current is equal due to its self-regulating The effect of intensity also automatically almost completely eliminates the requirements of the different types of underfire gas.
Erfindungsgemäss werden die Einstellungen der Kreisstromintensitäten in den verschiedenen Heizzügen einer Heizwand durch konstruktive Auslegung bzw. Einregulierung der Widerstände in den Strömungswegen so gewählt, dass bei einer Leistungs - oder Gasartänderung der Ofenbeheizung die selbstregulierende Wirkung des Kreisstroms optimal genutzt wird.According to the invention, the settings of the circulating current intensities in the different heating trains of a heating wall are selected by constructive design or regulation of the resistances in the flow paths in such a way that the self-regulating effect of the circulating current is optimally used when the output or gas type of the furnace heating is changed.
Da die Intensität der Kreisströme in den Heizzügen wesentlich durch die Grösse der Kreisstrom- und Umkehrstellenquerschnitte in den Binderwänden beeinflusst wird, sieht die Erfindung vor, dass diese Querschnitte über die ganze Wandlänge oder zonenweise jeweils einzeln oder gemeinsam von der Maschinen- zur Koks - seite hin variiert werden. Bei gemeinsamer Änderung kann diese proportional gleichsinnig oder ungleichsinnig erfolgen.Since the intensity of the circulating currents in the heating trains is significantly influenced by the size of the circulating current and reversal cross-sections in the truss walls, the invention provides that these cross-sections over the entire wall length or zone by zone individually or together from the machine to the coke side can be varied. In the case of a common change, this can be done proportionally in the same direction or in the opposite direction.
Die Erfindung sieht vor, dass die Gesamtquerschnitte je Kreisstrom- oder Umkehrstelle aus einer oder mehreren Öffnungen bestehen. Sie sieht ferner vor, dasa jede oder einzelne dieser Öffnungen mit einem oder mehreren Drosselorganen, z. B. Schiebern oder Klappen, versehen werden kann.The invention provides that the total cross sections for each circular flow or reversal point consist of one or more openings. It also provides that each or each of these openings with one or more throttling members, e.g. B. sliders or flaps can be provided.
Ferner sieht die Erfindung vor, dass die Intensitäten der Kreisströme in den Heizzügen durch zusätzliche Gasstrahlen von erhöhter Geschwindigkeit in an sich bekannter Weise - gegebenenfalls unterschiedlich - verstärkt werden .Furthermore, the invention provides that the intensities of the circulating currents in the heating trains are increased by additional gas jets of increased speed in a manner known per se - if necessary differently.
Die Erfindung ist in der Zeichnung beispielsweise veranschaulicht. Es zeigen :
- Fig. 1 einen senkrechten Schnitt durch ein Heizzugpaar und
- Fig. 2 einen Schnitt nach der Linie A - A der Fig. 1 .
- Fig. 1 shows a vertical section through a pair of Heizzug and
- 2 shows a section along the line A - A of FIG. 1st
Mit 1 und 2 sind die beiden Heizzüge bezeichnet, die ein Heizzugpaar bilden und abwechselnd in bekannter Weise aufwärts beflammt werden. Dieses Heizzugpaar - auch Zwillingsheizzüge genannt - stellt einen Ausschnitt einer Heizwanddar, die aus einer Vielzahl sich nach links und rechts bis zur Maschinen- bzw. Koksseite anschliessender Zwillingsheizzüge besteht.1 and 2 denote the two heating trains which form a pair of heating trains and are alternately flamed upwards in a known manner. This pair of heating trains - also called twin heating trains - represents a section of a heating wall, which consists of a large number of twin heating trains connecting to the left and right up to the machine or coke side.
Die Trennwand 3 der Heizzüge 1 und 2 weist an ihrem unteren auf, Ende zwei Kreisstromöffnungen 4/die im vorliegenden Falle je - weils mit einer oder auch mehreren Klappen 5 verschlossen werden können. Die Querschnitte der Kreisstromöffnungen sind erfindungsgemäss, wie vorstehend näher erläutert, von der Maschinen- zur Koksseite unterschiedlich.The partition 3 of the
Am oberen Ende der Trennwand 3 sind die Heizzüge bei der dargestellten Ausführungsform durch zwei übereinander liegende Öffnungen 6 und 7, den sogenannten Umkehrstellen, miteinander verbunden. Jeder dieser Öffnungen ist im vorliegenden Falle eine Rolle 8 bzw. 9 zugeordnet, die diese Öffnung ganz oder teilweise freigeben oder auch praktisch völlig verschliessen kann. Die Querschnitte der beiden Umkehrstellen sind vorzugsweise ebenso wie die der Kreisstromöffnungen von der Maschinen - zur Koksseite unterschiedlich ausgelegt.At the upper end of the partition 3, the heating cables in the embodiment shown are connected to one another by two
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT82105270T ATE29898T1 (en) | 1981-07-01 | 1982-06-16 | METHOD OF HEATING COKE OVEN AND EQUIPMENT FOR IMPLEMENTING THE METHOD. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3125886 | 1981-07-01 | ||
| DE19813125886 DE3125886A1 (en) | 1981-07-01 | 1981-07-01 | METHOD FOR HEATING COOKING OVENS AND DEVICE FOR CARRYING OUT THE METHOD |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0068304A2 true EP0068304A2 (en) | 1983-01-05 |
| EP0068304A3 EP0068304A3 (en) | 1984-10-03 |
| EP0068304B1 EP0068304B1 (en) | 1987-09-23 |
Family
ID=6135821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP82105270A Expired EP0068304B1 (en) | 1981-07-01 | 1982-06-16 | Process for heating coke ovens and system for carrying out the process |
Country Status (11)
| Country | Link |
|---|---|
| EP (1) | EP0068304B1 (en) |
| JP (2) | JPS587479A (en) |
| AR (1) | AR228499A1 (en) |
| AT (1) | ATE29898T1 (en) |
| AU (1) | AU553625B2 (en) |
| BR (1) | BR8203811A (en) |
| DE (2) | DE3125886A1 (en) |
| ES (1) | ES513079A0 (en) |
| IN (1) | IN157902B (en) |
| NO (1) | NO159803C (en) |
| ZA (1) | ZA823745B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106675584A (en) * | 2016-11-11 | 2017-05-17 | 中冶焦耐(大连)工程技术有限公司 | Structure and method for adjusting lengthwise air-flow distribution of coke oven by synergizing upper part with lower part |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI681048B (en) | 2017-09-15 | 2020-01-01 | 德商蒂森克虜伯工業解決方案股份有限公司 | Coke oven device having a circular flow path with an encircling flow around it for the production of coke, and method for operating the coke oven device, and control installation, and use thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE911727C (en) * | 1939-11-17 | 1954-05-17 | Koppers Co Inc | Chamber furnace for the production of gas and coke |
| DE1936023A1 (en) * | 1969-07-16 | 1971-02-04 | Koppers Gmbh Heinrich | Device for the complete or partial closing of the gas passage openings in the heating walls of coking chamber ovens |
| DE2161638A1 (en) * | 1971-12-11 | 1973-06-20 | Koppers Gmbh Heinrich | METHOD OF COMPARATIVE HEATING OF HORIZONTAL CHAMBER COOKING FURNACE AND EQUIPMENT FOR CARRYING OUT THE METHOD |
-
1981
- 1981-07-01 DE DE19813125886 patent/DE3125886A1/en not_active Withdrawn
-
1982
- 1982-05-24 IN IN600/CAL/82A patent/IN157902B/en unknown
- 1982-05-28 ZA ZA823745A patent/ZA823745B/en unknown
- 1982-06-14 ES ES513079A patent/ES513079A0/en active Granted
- 1982-06-15 AR AR289690A patent/AR228499A1/en active
- 1982-06-16 DE DE8282105270T patent/DE3277376D1/en not_active Expired
- 1982-06-16 EP EP82105270A patent/EP0068304B1/en not_active Expired
- 1982-06-16 AT AT82105270T patent/ATE29898T1/en active
- 1982-06-21 JP JP57105571A patent/JPS587479A/en active Pending
- 1982-06-30 BR BR8203811A patent/BR8203811A/en unknown
- 1982-06-30 NO NO822288A patent/NO159803C/en unknown
- 1982-06-30 AU AU85477/82A patent/AU553625B2/en not_active Ceased
-
1991
- 1991-10-09 JP JP1991081977U patent/JPH0489535U/ja active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE911727C (en) * | 1939-11-17 | 1954-05-17 | Koppers Co Inc | Chamber furnace for the production of gas and coke |
| DE1936023A1 (en) * | 1969-07-16 | 1971-02-04 | Koppers Gmbh Heinrich | Device for the complete or partial closing of the gas passage openings in the heating walls of coking chamber ovens |
| DE2161638A1 (en) * | 1971-12-11 | 1973-06-20 | Koppers Gmbh Heinrich | METHOD OF COMPARATIVE HEATING OF HORIZONTAL CHAMBER COOKING FURNACE AND EQUIPMENT FOR CARRYING OUT THE METHOD |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106675584A (en) * | 2016-11-11 | 2017-05-17 | 中冶焦耐(大连)工程技术有限公司 | Structure and method for adjusting lengthwise air-flow distribution of coke oven by synergizing upper part with lower part |
Also Published As
| Publication number | Publication date |
|---|---|
| AU8547782A (en) | 1984-01-05 |
| NO822288L (en) | 1983-01-03 |
| ES8307279A1 (en) | 1983-07-01 |
| JPH0489535U (en) | 1992-08-05 |
| EP0068304A3 (en) | 1984-10-03 |
| JPS587479A (en) | 1983-01-17 |
| DE3277376D1 (en) | 1987-10-29 |
| ZA823745B (en) | 1983-03-30 |
| AR228499A1 (en) | 1983-03-15 |
| ATE29898T1 (en) | 1987-10-15 |
| IN157902B (en) | 1986-07-19 |
| DE3125886A1 (en) | 1983-01-27 |
| ES513079A0 (en) | 1983-07-01 |
| NO159803C (en) | 1989-02-08 |
| AU553625B2 (en) | 1986-07-24 |
| BR8203811A (en) | 1983-06-28 |
| EP0068304B1 (en) | 1987-09-23 |
| NO159803B (en) | 1988-10-31 |
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